X-ray CT system

Details X-ray CT system X-ray CT system

1997-07-21

1999-11-16

Bruce, David Vernon

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 4, 378901, A61B 603

Patent

active

059870915

ABSTRACT:
Projection data having a phase difference of 180.degree. from each other, which are obtained through a 1/4 offset detector, are arranged alternately to obtain projection data of the high resolution, and a CT image is reconstructed on the basis of the projection data of the high resolution. Opposition difference data showing the difference between the projection data having the phase difference of 180.degree. from each other and having a phase difference of 180.degree. from each other are alternately arranged to obtain the opposition difference data of the high resolution, and an opposition difference image is reconstructed on the basis of the opposition difference data of the high resolution. Then, distortion components showing the high-frequency component are extracted from the aforesaid opposition difference image, and the aforesaid reconstructed CT image is corrected by the thus extracted distortion components, so that motion artifacts contained in the original CT image can be reduced.

REFERENCES:
patent: 4280178 (1981-07-01), Nassi et al.
patent: 4740896 (1988-04-01), Horiba et al.

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